brain jogged...quick help please

[Billyin4C]

Once the user selects the proper membership, why can't I get the correct rewards (display function) to print??

  
#include <iostream>
#include <iomanip>
using namespace std;

//function prototypes
void displayStandard(double totalBalance);
void displayPlus(double totalBalance);
void displayPremium(double totalBalance);

int main()
{
	char membership = ' ';
	double balance = 0.0;
	double points = 0.0;

	
	
	cout << "(A) Standard " << endl;
	cout << "(B) Plus " << endl;
	cout << "(C) Premium " << endl;
	cout << "Enter membership type (A, B, C):  ";
	cin >> membership;

	while (toupper(membership) != 'A' && toupper(membership) != 'B' && toupper(membership) != 'C')
	{
		cout << "Please enter A, B, or C: " << endl;
		cin >> membership;
	}
		

	cout << "Please enter your total monthly purchase: ";
	cin >> balance;
		
		if (membership == 'A')
		
			displayStandard(points);
		
		else if (membership == 'B')
		
			displayPlus(points);
		
		else if (membership == 'C')
		
			displayPremium(points);
		
	

	system("pause");
	return 0;
}//end of main

//*****function definitions*****

double rewards = 0.0;
void displayStandard(double totalBalance)
{
	if (totalBalance < 75)
		rewards = .05 * totalBalance;
	
	else if (totalBalance >= 75 && totalBalance <= 149.99)
		rewards = .075 * totalBalance;

	else (totalBalance >= 150);
	rewards = .10 * totalBalance; 

	cout << fixed << setprecision(0);
	cout << "STANDARD " << endl;
	cout << "--------"<< endl;
	cout << "You have earned " <<rewards << " reward points!" << endl << endl;
}//end of standard function

void displayPlus(double totalBalance)
{
	if (totalBalance < 150)
		rewards = .06 * totalBalance;
	else
		rewards = .13 * totalBalance;

	cout << fixed << setprecision(0);
	cout << "PLUS" << endl;
	cout << "----" << endl;
	cout << "You have earned " <<rewards << " reward points!" << endl << endl;
}//end of plus function

void displayPremium(double totalBalance)
{
	if (totalBalance < 200)
		rewards = .04 * totalBalance;
	else
		rewards = .15 * totalBalance;

	cout << fixed << setprecision(0);
	cout << "PREMIUM" << endl;
	cout << "-------" << endl;
	cout << "You have earned " << rewards << " reward points!" << endl << endl;
}//end of premium function 

[TarikNeaj]

Becasue, you save the total monthly purchase in the variable "balance"

cout << "Please enter your total monthly purchase: ";
cin >> balance;

Then when you call the function, you hand them the variable "points" - displayStandard(points);

Which is 0. And anything multiplied with 0 is 0.

I'd also recommend that you create a variable called reward in each function, you don't want global variables like you have right now.

[Billyin4C]

I fixed the global reward variable, should i pass the points variable to the functions to get it to work?

[TarikNeaj]

fixed the global reward variable, should i pass the points variable to the functions to get it to work?

You are already doing this - displayPlus(points); // passing points

But if you look at your main. You initialize points - double points = 0.0; to 0, then you do nothing with it at all. So then you send it to the function with the value 0, after multiplication get 0.

If "totalBalance" is supposed to represent the value of what the user enters, then you want to pass the balance variable since that is where you store that information

displayPlus(balance);